There's a question mark behind Arkane's future anyhow... at least for a long-term fan. Not quite sure what Blade is gonna be. As to increasing the system requirements, that's how it's always worked, naturally. The entire AAA industry is basically pushing the latest tech -- you may naturally ask at this point whether anybody would even buy Assassin's Creed like 15 for 80 bucks if not even the gfx would be improving anymore. However, upgrade cycles have gotten slower, as games are being developed with 5 years old tech (consoles) as the base. Gotta be honest, though: I'd rather buy 3-4 15-20 bucks indie games than a blockbuster one these days. Those also tend to be more focused, rather than trying to offer a little bit of everything for no one. Exceptions are projects I want to support or games that I REALLY consider premium.
Thing is, outside of production values, the big boys aren't even the "premium" in this industry anymore. All they have is the cash to spend. However, as they are rarely allowed to invest it into anything interesting... I mean, it's worse than Hollywood. Hollywood still finds a slot for at least a del Toro, Burton, Nolan movie. In gaming, it's mostly an endless wave of remakes, remasters, sports games and recycled trends now. Lately even at industry award shows, it was studios that kept some independence / control over their projects that came out superior. Bit of rambling, sorry. But consider this: Even the last "fresh" Rockstar IP was tackled and shaped like two decades ago: L.A. Noire. Development started at Team Bondi in 2004/2005. That's just crazy.
Speaking of which, these guys seemed to have one helluva time making their gaming dreams come true. It shows in the game for sure.